error with the case statement use what void const query
Hi all.I have found the error in the result set, and then use subqueries and cases of declaration.
Preparation for example.
2 examples of tables creation.
CREATE TABLE T1
AS
(
SELECT 1 ID , 1 F1 FROM DUAL
UNION
SELECT 2 ID , 1 F1 FROM DUAL
UNION
SELECT 3 ID , 1 F1 FROM DUAL
) ;
CREATE TABLE T2
AS
(
SELECT 2 ID FROM DUAL
UNION
SELECT 3 ID FROM DUAL
) ;
This statement returns NULL in subquerySELECT
T1.ID, TT2.ID , TT2.ISBUG AS NO_BUG
FROM T1
LEFT JOIN
(
SELECT ID , -1 ISBUG FROM T2
)TT2
ON T1.ID = TT2.ID
WHERE TT2.ID IS NULL
But this statement (with operator CASE) does NOT return null in subquerySELECT
CASE WHEN 1 = 1 THEN 1 END AS C1,
T1.ID, TT2.ID , TT2.ISBUG
FROM T1
LEFT JOIN
(
SELECT ID , -1 ISBUG FROM T2
)TT2
ON T1.ID = TT2.ID
WHERE TT2.ID IS NULL
Why?Oracle 11.2.0.2.0
Published by: 927438 on 13.04.2012 03:27
Published by: 927438 on 13.04.2012 03:31
Maybe it is related to this one
outer join of 11g with case - strange results statement.
seems to be a bug
Tags: Database
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937454 wrote:
Thanks Frank. Really helps. But I have to write a sql statement
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Oracle SQL has BOX expressions, but they only return a single value. You cannot set 2 columns in the same expression BOX.
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Published by: JAC on October 12, 2012 19:08
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